How to find the given date is with in specified date range

Question

Here is my code

boolean isWithinRange(String d)
{
    boolean withinDate = false;   
    try
    {
        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        Date date = dateFormat.parse(d);
        withinDate = !(date.before(startDate) || date.after(endDate));
    }
    catch (ParseException parseException)
    {
     }
    return withinDate;
}

Inputs

2015-11-26
2015-11-26 - Copy

Both returning true but what i required is "2015-11-26" should be true and "2015-11-26 - Copy" should be false.

BetaRide · Accepted Answer · 2015-12-11T06:09:29.597

5

This is because SimpleDateFormat happily parses "2015-11-26" and ignores the " - Copy" part.

The javadoc states :

Parses text from the beginning of the given string to produce a date. The method may not use the entire text of the given string.

To detect if the whole string has been used, instead use the parse(String source, ParsePosition pos) method. ParsePosition tells you where parsing stopped. Just compare this with the length of the original date string.

edited Dec 11 '15 at 06:09

answered Dec 11 '15 at 05:56

BetaRide

16,207
29
99
177

Do i need to trim the date string before parse?. Is there any other way without trim the date string. – Prabhakaran Ramaswamy Dec 11 '15 at 05:58

score 1 · Answer 2 · answered Dec 11 '15 at 06:01

The problem here is we are passing the Date Format 'yyyy-MM-dd'. This will verify the given input upto this format.

For example,

static boolean isWithinRange(String d)
{
    boolean withinDate = false;   
    try
    {
        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        Date date = dateFormat.parse(d);
        withinDate = !(date.before(startDate) || date.after(endDate));
    }
    catch (ParseException parseException)
    {
        parseException.printStackTrace();
     }
    return withinDate;
}

The above code throw exception because we are passing Date format as 'yyyy-MM-dd hh:mm:ss'. So this will find the hour minutes and seconds

score 0 · Answer 3 · answered Dec 11 '15 at 07:42

0

just test if size is 10 before your test:

if (d.length!10) return false;

answered Dec 11 '15 at 07:42

guillaume girod-vitouchkina

3,061
1
10
26

score -1 · Answer 4 · answered Dec 11 '15 at 06:24

-1

public static void main(String[] args) {
    isWithinRange("2015-12-11 - Copy");
    isWithinRange("2015-12-11");

}

public static boolean isWithinRange(String d) {
    boolean withinDate = false;
    try {
        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        String dd = d.indexOf(" ") !=-1 ? d.substring(0, d.indexOf(" ")) : d; // Find valid String 
        if(d.equals(dd)){
        Date date = dateFormat.parse(d);
        withinDate = !(date.before(startDate)) || date.after(endDate)));
        }else{
            withinDate =false;
        }
    } catch (ParseException parseException) {
    }
    return withinDate;
}

answered Dec 11 '15 at 06:24

Rahul Bhawar

450
7
17

That does work only if `d` has a space as the first character which is not part of the date. This would still return `true` for something like `2015-12-11-Copy`. – BetaRide Dec 11 '15 at 06:37
User need to take care about first space but he/she confuse about it , trim() the leading and lagging spaces of input string. – Rahul Bhawar Dec 11 '15 at 06:49
You will find trim() [http://stackoverflow.com/questions/6652687/strip-leading-and-trailing-spaces-from-java-string] – Rahul Bhawar Dec 11 '15 at 06:52

How to find the given date is with in specified date range

4 Answers4